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Simplifying -7z + 20 = -3z Reorder the terms: 20 + -7z = -3z Solving 20 + -7z = -3z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '3z' to each side of the equation. 20 + -7z + 3z = -3z + 3z Combine like terms: -7z + 3z = -4z 20 + -4z = -3z + 3z Combine like terms: -3z + 3z = 0 20 + -4z = 0 Add '-20' to each side of the equation. 20 + -20 + -4z = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -4z = 0 + -20 -4z = 0 + -20 Combine like terms: 0 + -20 = -20 -4z = -20 Divide each side by '-4'. z = 5 Simplifying z = 5
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